Merge into master from pull request #1946: openflowj: enforce buffer_id XOR payload for PacketOut (https://github.com/bigswitch/bigswitchcontroller/pull/1946)

FLOODLIGHT-13 -     Event history size is now configurable via net.floodlightcontroller.linkdiscovery.internal.LinkDiscoveryManager.eventhistorysize = <int> in the properties file. FLOODLIGHT-11 -     The log message for received LLDPs that we did not send out has been updated.

FLOODLIGHT-28 - Change the LearningSwitch FlowMod/PacketOut buffer ID logic. We now send FlowMods with BUFFER_ID_NONE and then PacketOut the packet with the buffer ID. - Add LearningSwitch properties file options to change hard/soft flow timeouts as well as priority. - Add a learningswitch.properties file.

Add more error checking into the links identified on ports.  Classify any ports with inconsistent links seen as broadcast domain ports.

Merge into master from pull request #1930: More resilient OF message handling with role changes. (https://github.com/bigswitch/bigswitchcontroller/pull/1930)

* Only dispatch OF messages to listeners if the switch is in the active
  switch map (and is in MASTER role and connected).
  Fixes BSC-2829
* When transitioning to MASTER: notify IHAListeners of role-change
  before starting dispatching messages. When transitioning to SLAVE:
  stop dispatching before notifying IHAListeners.
  Fixes BSC-2407

Fix tab in LinkDiscoveryManager; fix duplicate getInetAddress() after merge in IOFSwitch and test/../OFMessageDamperMockSwitch

Fix Conflicts:
	src/main/java/net/floodlightcontroller/core/internal/OFSwitchImpl.java

adding getInetAddress() as a function for IOFSwitch

Various UI fixes and improvements

When injecting fake ARP: set sender IP to 0 (ARP probe)
Remove weird IP learning on DHCP-replies:
	WILL BREAK DHCP MANAGER WITH RELAYS

It now defers loading any data until the UI has been drawn, avoiding a blank
screen. Now the dashboard is drawn (~1s) and then filled in with data. The
remaining bottleneck is probably the number of XHRs; concatenating JS and
templates and fetching switch data in bulk instead of individually would
reduce the number of XHRs dramatically.

Merge into master from pull request #1907: Implement BigOFSwitchImpl, default BigFloodlight switch driver (https://github.com/bigswitch/bigswitchcontroller/pull/1907)

Also fixed OVS local port display.